Automatic stop for phonographs



July 3, 1923.

Filed Feb. 7, 1921 Patented July 3, 1923.

name

MARIUS E. GRISWOLD, OF BURLINGTON, IOWA.

AUTOMATIC STOP FOR PHONOGRAPHS. 7

Application filed February 7, 1921. Serial No. 442,926.

T all whom it may concern.

Be it known that I, Memos E. Gin'swonn, a citizen of the United States, residing at Burlington, in the county of Des Moines and State of Iowa, have invented certain new and useful Improvements in Automatic Stops for Phonographs, of which the following is a specification.

This invention relates to an automatic stop for phonographs and has for its primary object to provide a simpleand eflicient device for automatically stopping the turn-' table of the phonograph at the completion of a predetermined advance of the stylus in the record groove.

Another important object of the invention is to provide an automatic stop mechanism which is actuated by the rotation of the turn-table.

Further objects of'the invention are to provide manually operable auxiliary controlling means for the stop mechanism permitting the turn-table to be stopped at any time irrespective of the setting of the. auto matic stop, to provide clutch mechanism for controlling the actuation of the automatic stop, and to permit the entire stop mechanism to be located beneath the turn-table.

The many other objects and advantages of the invention will be better understood.

by reference to the following specification when considered in connection with the accompanying drawing illustrating a'selected embodiment thereof, in which v Fig. 1 is a plan View of the invention with the latch released and the turn-table stopped.

Fig.2 is the same as Fig. 1 but with the latch engaged and the turn-tablereleased.

Fig. 3 is a section on the line 3-3 of Fig. 1; and,

Figs. 4 and 5 are detail views.

Referring to the drawing, the automatic stop forming the present invention is mounted upon a base plate which is secured.

upon the usual top platform or motor board of the pho'nographby screws 11 or other suitable means. This plate 10 is provided with an indicating dial 12 which is graduated to indicate the various settings of the indicating pointer -13. The pointer 13 is pivotally mounted upon the plate 10 at 14 and is provided with a laterally projecting arm 15 extending substantially radially from the axis of revolution of the pointer. A pin 16 has its lower extremity seated in the outer end portion of the arm 15, and

earner series..-

1.9 inthe trip 20. The latch lever 18 is pivotallymountedatM in'the same manner as the indicating arm 13. The trip 20 is pivotally mounted at 21 on the outer extremity of the latch lever 18., p v v A brake lever 22 is pivotallymountedat 23 upon the base-plate 10. A brake 24 is pivotallymounted at 25 on the outer extrem-.

ity of the laterally projecting arm 26 formed on the brake lever 22. A clutch guidebar 27 has its extremities by oppositely disposed upturned lugs 28 and 29 formed respectively on the brake lever. 22 and the clutch lever 22. A clutch member' 30 is slidably mounted upon this bar 27,

and a ,coil compression spring 31. acts between this member 30 and the lug 28 t0 normally retain theclutch member against the lug 29. A friction Washer 32 may be placed upon thebar'27 in contact with the inner face of the lug 29 to eliminate any noise which might occur by theimpact of themetal clutch member 30 with the lug 29 during the operation of the stop mechanism. Theouter portion of. the clutch member 30 is provided' with an elongated slot 33 "through which passes the feed screw 34:. The outer extremity 35 of the clutch member 30 has" the form ofa. segment of a sleeve, and" the inner face of this segment is threaded to mesh with the threads upon. the feed screw 34: when moved into engagement therewith. N The outer extremity of the brake-lever 22 is connected by an extensible spring 36 with'a'pr'oje'ction 37 on the latch lever 18.; The latch lever l8-is provided with a'shoul-, der38which is adapted to engage a downwardly turned lug 39 upon the brake lever 22 to retain the brake lever in the position indicated in Fig. 2 of the drawing. This supported latch also maintains the guide barj27 and s the feedscrew 34c in parallel relation to en able the clutch member '30 to be "advanced by the feed screw when the clutch sleeve 35, of the member 30' is in mesh With the threads upon this rod.

- The feed'scr'ew 34' has itsreduced inner on the inner extremity of thebase plate 10.

extremity 42 secured to the'base plate by end supportedby an upturned lug 40 formed 1 the rivet forming the pivot 23. This bracket has an upturned portion 43 and a downturned end 4 lthrough which the reduced outer extremity of the feed screw 84: passes. The end portion l i of the bracket abuts against the shoulder formed at the junction of the reduced end of the feed screw and the larger threaded portion to coact with the lug 40 to prevent longitudinal movement of the screw. A toothed wheel or ratchet i5 secured upon the 'inner end of the feed screw 34 and is adapted to be operated by a finger 46 of thin spring metal secured upon the under face of the turn-table 47 in themanner indicated in Fig. 3 or the drawing. This finger is provided with an inclined face 48 which is disposed in the path of the teeth of the wheel so so that this face contacts with the tooth presented and provides a rotation of the wheel one tooth dis tance. The extremity 49 01 this finger is turned upwardly so that when the inclined face of the finger yieldingly rides over the tooth the extremity of the finger engages the next tooth and prevents any spinning of the wheel. The primary function 01": this type of finger is to eliminate noise due to the impact of the finger with the wheel which would be most likely to occur when a stationary wheel is struck by a rapidly moving rigid member.

The trip 20 is adjusted by the index pointer 13 in order to cause the latch lever to be automatically released at the completion of the rendition of the selection on the record. This trip is rotated upon the pivot 21 as a center by movement of the index pointer 13 relative to the graduated dial 12, but such movement of the index pointer and the trip does not move the latch lever. Similarly the movement of the trip by the engagement of its free end with the clutch member 30 moves the latch lever but does not move the index pointer.

A manually operated auxiliary stop lever 51 is pivotally mounted upon the base plate 10 at 52. A. link 53 connects the inner extremity :34 of the lever 51 with the latch lever 18. A. thumb piece 55 is provided on the outer extremity of this lever 51 to enable the brake lever 22 to be released at any time during the operation oi the phonograph and thus stop the turn-table.

The clutch member 30 is moved into and ut of operative engagement with the teed screw' 34 by the clutch lever 22 which is pivotally connected to the brake lever 22 at 56. This lever 22 is provided with a short arcuate slot 57 through which passes the eyelet forming the pivot This eyelet is crimped upon the brake shoe 2% pivoted thereon and forms a frictional engagement between the arm 26 oi? the base plate, the clutch lever 22. and the brake. Movement of the outer extremity .58 of the clutch lever in a clockwise direction from the extreme position indicated in Fig. l first causes the lever to swing on its pivot 56, moving the clutch member 30 out of engagement with the feed screw. This movement is permitted by the slot 57. lVhen the end of the slot is reached, further clockwise movement oi the extremity 58 of the clutch lever causes this lever to turn on-the pivot 25 as a center, swinging the brake lever upon the pivot 23 in a clockwise direction sufliciently to cause the latch lever to engage the locking lug on the brake lever, in the position indicated in 2 of the drawing. During this movement the brake shoe is moved out of engagement wita the turn-table and the latter commences to rotate. lVhen the brake lever is thus locked, movement of the extremity 5B. of the lever 22 in a counter clockwise direction causes this lever to rotate on the pivot 56 and to throw the clutch member 30 into operative engagement with the feed screw.

in the operation of the device the index iter is set at the proper, graduation to. A ten the trip so that the turn-table is automatically stopped upon the completion of the pla i the selection. Different. records have uifl'erent lengths of sound-re,- produciug grooves usually defined by the number record lines between the axis of the record and the periphery thereof. The advance ot the thread on the teed screw 34, the number oi" teeth upon the feed wheel or ratchet. and the graduation of the dial, are so related that the extreme positions of the indicating pointer shall. locate the trip to stop the motor at the proper time for the maximum and minimum number of lines found on any records. The average record requires a settin at the graduation l0.

Having moved the clutch member 30 out of operative engagement and started the rotation of the turn-table in the manner described, the stylus should now be placed in the record groove. As soon as the rendition ol the selection begins the clutch lever 22 should be thrown to the right to engage the h member and start the advance of this on the teed screw. The trip hay- )een properly positioned for the particular record on the turn-table will be engaged by the clutch member at the completion of the selection. and the brake lever. released. automatically setting the brake and stoppi g the rotation of the turn-table. When the brake lever is released, the clutch member is disengaged from the feed screw and is moved'to its initial position by the spring 31.

The turn-table may be manually stopped at any time during the playing of the selection by :he auxiliary stoplever 51.

The proper setting of the index pointer for any particular record is determined by setting the pointer at thegraduation 0, start-- ing :the playing in, the usual. manner, and then manually stopping the turntable at the completion of-the playing ofthe selection, or as soon thereafter as is desired, by grasping it with the hand. Theindex pointer is now slowly mover l to the right until the trip strikes the clutch member and sets the brake. The position of the pointer onthe dial at the time of actuation of the stop mechanism should be notedand the number of the. grad-' nation marked uponthe record.v In all play ing of this record, thereafter, the pointer should be set at thev graduation thus determined and the record will be uniformly stopped at the proper point- It will .bereadily evident that with the present invention, the operation of the phonograph maybe automatically and accurately stopped at the completion of the ren dition of the selection on records of any length. Also'the operation may be stopped by auxiliary stopping means independently of the automatic action at any time. The

device operates noiselessly and without interference with the running of the'phonograph; The mechanism with the, exception of the control levers, the dial, and the index pointer, is entirely concealed beneath the turn-table. The device may be readily attached to any phonograph and located in the most convenient position about the axis of the turn-table. No parts of the stop mechanism are carried by or attached to the tone arm. This eliminates thenecessity for drilling holes in the tone arm, the unattractive appearance of parts of this nature when so attached, and the constant danger of accidental displacement of these parts.

.I am aware that a considerable number of changes may bemade in the construction tuating said stopmechanism.

and arrangement ofparts Without departing from the spirit of .my'invention, and I reserve the right to 'make all such as fairly fall within the scope of the following claims.

I'claim': I 1. In a phonograph, the combination with a revoluble turn-table, of an automatic stop mined by the position of saidmember, and

means revoluble with said turn-table for-ac- 3, In a phonograph,the combination with a revoluble turn-table, of an index-pointer,-

a dial, automatic stop mechanism controlled by said "pointer/and movable independently thereof to stop said turn-table at the completion ofa number. of revolutions determined by the 1 relative position of said pointer and dial; and means revoluble with said turntable for actuating said step mechanism.-

a. In a phonograph, thecombmatlon with,

revoluble turn-table, of automatic stop mechanism fo'rs'aid turn-table including feed screwxactuated by, the rotation of said turn-table, a latch, a trip for said latch, and i a trip actuating member fed by said screw. 5. In a'phonograph, the combination with a revoluble turn-table, of. automatic stop mechanism for said turn-table including afeed screw actuatedby the rotation of said turn-table,'a latch, a trip forsaid latch, a

trip actuating member normally disengaged fromflsaid screw, and means for moving said member into operative engagement with said screw to cause said member to'be advanced thereby to actuate said trip.

. 6. In a phonograph, the combination with a revoluble turntable, of automatic stop mechanism for-said'turmtable including a.

feed screw actuated by the rotation of said turn-table, a brake, a brake lever, a latch for said brake lever, a trip for said latch, a trip actuating member, and a clutch for. operatively engaging said member with'said screw to cause said member to be moved toward said trip by said screw. 1

7. In a phonograph, the combination with a revoluble-turntable, of automatic stop mechanism for said turnrtable' including a feed screw intermittently actuated by the rotation of said turn-table, a latch, atrip for said latch, a trip actuating member','. and a manually controlled clutch for operatively engagingsaid member with said screw.

8. In a phonograph, thecombination with a revoluble turn-table, of automatic stop' mechanism for said turn-table including a feed screw actuated by a projection on said turn-table, alatch, an adjustable trip for said latch, and means actuated by said feed screw for operating said trip.

.phonographs comprising a latch, atrip for 9. An automatic. stop mechanism for,

said latch, feed screw, andmeans operated",

by saldfeed screw for actuating said trip'to release said latch at the termination of a" predetermined number of revolutionsof said.v

feed screw. g 1 10. An automatic stop mechanism for phonographs comprising a brake, a -brake I lever, a latch for said lever, an adjustable trip for saiclllatch, a' feed screw, and atripj actuatingmember operable by said screw,

11. An automatic stop mechanism for phonographs comprising a brake, a brake lever, a latch for said lever, an adjustable trip for said latch, a feed screw, atripactua-ting member, and a clutch for operatively engaging said member with said screw.

12. An automatic stop mechanism for phonographs comprising a brake, a brake lever, a latch for said lever, a trip for said latch, a trip actuating member, a feed screw for advancing said member toward said trip, and means for adjusting the position of said trip.

13. An automatic sto mechanism for phonographs comprising a brake, a brake lever, a latch for said lever, a trip for said latch, a trip actuating member, a feed screw for ad vancing said member into operative engagement with said trip, and means for returning said member to its initial position upon the release of said latch by said trip.

mechanism for said turntable including a feed screw actuated by a member revoluble with said turntable, a latch, an adjustable trip for said latch, and means actuated by said feed screw for operating said trip.

15. In a phonograph, the combination with a revoluble turn table, of automatic stop mechanism for said turn table, a finger revoluble with said turn table for actuating said mechanism and means adjustable independently of said mechanism for tripping said mechanism to cause the same to stop said turn table at the completion of a predetermined number of revolutions.

MARIUS E. GR-ISW'OLD. 

